<div dir="auto">Hi Tonya,<div dir="auto"><br></div><div dir="auto">Freezing slides is not a good idea because of both the mounting media and the glass itself. I agree with Genevieve that if you're worried, you can go with anoxia as a possibility.</div><div dir="auto"><br></div><div dir="auto">Please check <a href="http://museumpests.net">museumpests.net</a> for more information on this topic, but you can email me directly if you have questions about the process.</div><div dir="auto"><br></div><div dir="auto">Best,</div><div dir="auto">Mariana</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 15, 2021, 09:31 Tocci, Genevieve Elizabeth <<a href="mailto:glewis-g@oeb.harvard.edu">glewis-g@oeb.harvard.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-family:"Georgia",serif">Hi Tonya,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">I also agree. I know with some of our collections we have slide label deterioration in some places due to silverfish and psocid activity. The risks are the same as explained previously, and we never
freeze the wet mounts we have in addition to the solid mounts, but they can be damaged by pests.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">If you want to treat the slides because there is evidence of label damage due to pest activity and anoxia treatment would be an alternative. It is longer and more expensive, but would take care
of pests and be less risk to the slides. (Or so I am led to believe but welcome a conservator to jump in and correct me.)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Good luck<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Genevieve<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Georgia",serif;color:#7f7f7f;background:white">=================================================</span><span style="font-family:"Georgia",serif;color:#7f7f7f"><br>
<span style="background:white">Genevieve E. Tocci (she, her, hers)</span><br>
<span style="background:white">Senior Curatorial Technician</span><br>
<span style="background:white">Harvard University Herbaria</span><br>
<span style="background:white">22 Divinity Ave., Cambridge, MA 02138 U.S.A.</span><br>
<span style="background:white">Phone: 617-495-1057 Fax: 617-495-9484</span><br>
<span style="background:white"><a href="mailto:glewis-g@oeb.harvard.edu" target="_blank" rel="noreferrer">glewis-g@oeb.harvard.edu</a></span></span><span style="font-family:"Georgia",serif;color:#7f7f7f"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Georgia",serif"><u></u> <u></u></span></p>
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<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu" target="_blank" rel="noreferrer">nhcoll-l-bounces@mailman.yale.edu</a>> <b>
On Behalf Of </b>Simon Moore<br>
<b>Sent:</b> Thursday, April 15, 2021 7:00 AM<br>
<b>To:</b> Hawks, Catharine <<a href="mailto:HawksC@si.edu" target="_blank" rel="noreferrer">HawksC@si.edu</a>><br>
<b>Cc:</b> NHCOLL-new <<a href="mailto:nhcoll-l@mailman.yale.edu" target="_blank" rel="noreferrer">nhcoll-l@mailman.yale.edu</a>><br>
<b>Subject:</b> Re: [Nhcoll-l] Freezing as preventative pest treatmenet<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Yes, definitely don’t freeze slides! You will create all sorts of problems!<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black">With all good wishes, <br>
<br>
Simon Moore MIScT, RSci, FLS, ACR<br>
Conservator of Natural Sciences and Cutlery Historian,</span><br>
<br>
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.natural-2Dhistory-2Dconservation.com&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=EYdhJ0HrhAMcA2aVQ-I4N7lml00zxsXPbHYeP7843No&m=lvi0MisllqzfU8popo8nBgTkYSagykxvs2nPgG_TqdU&s=HTPlO9gj_fWeuAZyHFO4H8OskJfvz-kmZRi5HlAYCAI&e=" target="_blank" rel="noreferrer">www.natural-history-conservation.com</a><br>
<br>
<br>
<img border="0" width="240" height="100" style="width:2.5in;height:1.0416in" id="m_1806779316838984911AC9B1AC3-EB0B-49FA-9C34-226050352B59" src="cid:image001.png@01D731D9.E56959F0"><img border="0" width="394" height="90" style="width:4.1041in;height:.9375in" id="m_1806779316838984911C58D3098-99F0-4B92-B5FD-167059253A27" src="cid:image002.jpg@01D731D9.E56959F0"><u></u><u></u></p>
</div>
<p class="MsoNormal"><br>
<br>
<u></u><u></u></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">On 15 Apr 2021, at 11:25, Hawks, Catharine <<a href="mailto:HawksC@si.edu" target="_blank" rel="noreferrer">HawksC@si.edu</a>> wrote:<br>
<br>
Hi Tonya<br>
<br>
I concur with Dirk – there is a greater risk of damage to the slides from freezing than from pests.<br>
<br>
Cathy<br>
Catharine Hawks (she, her, hers)<br>
Conservator<br>
Collections Program<br>
MRC 170 Rm M85-J<br>
National Museum of Natural History<br>
10th Street & Constitution Ave NW<br>
Washington DC 20560<br>
w 202.633.0835 or 4041 c 703 200 4370<br>
<a href="mailto:hawksc@si.edu" target="_blank" rel="noreferrer">hawksc@si.edu</a><br>
<br>
SMITHSONIAN INSTITUTION<br>
NATIONAL MUSEUM OF NATURAL HISTORY<br>
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<br>
<br>
<br>
<br>
<br>
From: Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu" target="_blank" rel="noreferrer">nhcoll-l-bounces@mailman.yale.edu</a>> On Behalf Of Dirk Neumann<br>
Sent: Thursday, April 15, 2021 1:54 AM<br>
To: <a href="mailto:nhcoll-l@mailman.yale.edu" target="_blank" rel="noreferrer">nhcoll-l@mailman.yale.edu</a><br>
Subject: Re: [Nhcoll-l] Freezing as preventative pest treatmenet<br>
<br>
External Email - Exercise Caution<br>
Hi Tonya,<br>
<br>
my personal thoughts are that this depends a bit on potentially different expansion coefficients of the slides embedding agents and cover slips and potentially unwanted condensation effects when moving the slides out of the freezers again.<br>
<br>
Birger Neuhaus at the MfN in Berlin published a really comprehensive piece on the conservation of microslides which is available here<br>
<br>
He basically says the same cautioning that mounting media might suffer from shrinkage and also the glass itself (depending on the quality especially in historic objects) might be damaged from this harsh temperature shock.<br>
<br>
Hope this helps<br>
Dirk<br>
<br>
****<br>
<br>
"Recently, the Museum für Naturkunde Berlin established in the frame of a pest management program a quarantine and freezing station for incoming parcels with special attention to entomological items returned from the borrower. Material from wet collections
and microscope slides are excluded from this practice, because both mounting media (Brown 1997, p. 6) and coverslip seals containing polymers (Shashoua 2008, p. 203) would suffer from shrinkage or formation of large hexagonal ice crystals, which pierce cell
membranes and the like during the freezing process (Florian 1990; Allington & Sherlock 2007a, 2007b). The latter authors demonstrated that damage occurred already after freezing coverslip seals just a few times. The consequences of these processes have already
been recognized at the Natural History Museum in London (Brown 1997)."<br>
<br>
<br>
<br>
Am 15.04.2021 um 00:59 schrieb Haff, Tonya (NCMI, Crace):<br>
Hello all,<br>
<br>
I am wondering if any of you have insight into freezing everything in a collection before moving in to a new building. Specifically, I am wondering about things like slides. Are histology, etc slides safe to be frozen at -30 to -40C? Is there anything else
that I should be thinking about? <br>
<br>
Thanks!<br>
<br>
Tonya<br>
<br>
Dr Tonya Haff<br>
Collection Manager<br>
Australian National Wildlife Collection<br>
<br>
<br>
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NHCOLL-L is brought to you by the Society for the Preservation of<br>
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